CVE-2024-2653

8.2 HighFix available

amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: High

Exploit likelihood

80.3%Up 80.2 points since Apr 4, 2024

What each source reports

CVE List Score used 8.2

CVE-2024-2653

amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.

Record: CVE-2024-2653
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

EUVDEUVD-2024-1280 8.2

amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.

Record: EUVD-2024-1280
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-qjfw-cvjf-f4fm 8.2

AMPHP Denial of Service via HTTP/2 CONTINUATION Frames

amphp/http will collect HTTP/2 CONTINUATION frames in an unbounded buffer and will not check the header size limit until it has received the END_HEADERS flag, resulting in an OOM crash. amphp/http-client and amphp/http-server are indirectly affected if they're used with an unpatched version of amphp/http. Early versions of amphp/http-client with HTTP/2 support (v4.0.0-rc10 to 4.0.0) are also directly affected.

Acknowledgements

Thank you to Bartek Nowotarski for reporting the vulnerability.

Record: GHSA-qjfw-cvjf-f4fm
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

NVD 8.2

amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.

Record: CVE-2024-2653
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

OSV 8.2

CVE-2024-2653

amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.

Record: CVE-2024-2653
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

OSVGHSA-qjfw-cvjf-f4fm 8.2

AMPHP Denial of Service via HTTP/2 CONTINUATION Frames

Acknowledgements

Thank you to Bartek Nowotarski for reporting the vulnerability.

Record: GHSA-qjfw-cvjf-f4fm
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`amphp/http` Packagist	2.0.0 to 2.1.0	2.1.1
`amphp/http` Packagist	through 1.7.2	1.7.3
`amphp/http-client` Packagist	4.0.0-rc10 to 4.0.0	None known
`amphp/http` Packagist	2.0.0 up to 2.1.1, plus listed versions v2.0.0v2.1.0	2.1.1
`amphp/http` Packagist	before 1.7.3, plus listed versions v1.0.0v1.0.1v1.1.0v1.2.0v1.3.0 Show 10 moreShow less v1.4.0v1.5.0v1.6.0v1.6.0-rc1v1.6.1v1.6.2v1.6.3v1.7.0v1.7.1v1.7.2	1.7.3
`amphp/http-client` Packagist	4.0.0-rc10 to 4.0.0, plus listed versions v4.0.0v4.0.0-rc10v4.0.0-rc11	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-2653 is a high vulnerability (CVSS 8.2) in Amphp Amphp/http, published April 3, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 80.3%, the 99th percentile. Fixed in amphp/http 2.1.1.

References

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